JP2017094665A - Adsorption pad and adsorption device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adsorption pad and an adsorption device which, by suppressing deterioration of an adsorption head part, can prevent reduction in production efficiency and increase in facility cost due to replacement of the adsorption head part, and can prevent contamination of a foreign matter with tread rubber.SOLUTION: An adsorption pad for adsorbing and conveying tread rubber comprises: a cylindrical adsorption head part formed of a hard material and having an open lower end; an adjustment plate arranged along an inner wall surface of the cylindrical adsorption head part; and lifting means for lifting the adjustment plate along the inner wall surface of the adsorption head part to adjust a length of an insertion part inserted into the tread rubber. The adsorption pad is configured to adsorb the tread rubber by inserting a lower end of the insertion part into the tread rubber and decompressing the inside of the adsorption head part.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a suction pad used in forming a green tire and a suction device including the suction pad.

  In the manufacturing process of a pneumatic tire, a tire component (carcass member, bead, sidewall, etc.) is sequentially attached to a forming drum, and then a tread rubber is attached to form a green tire. Patent Document 1).

  In the formation of the green tire, when adhering tread rubber, a suction pad provided with a cylindrical sponge as the suction head portion a1 as shown in FIG. 8 is used. FIG. 8 is a diagram schematically showing a conventional suction head, where (a) is a front view and (b) is a bottom view.

  Specifically, as shown in FIG. 9, after the tip of the tread rubber T conveyed on the servicer b is adsorbed and lifted by the two suction pads a, the tread rubber T is moved toward the molding drum c. Transport. In addition, as shown in FIG. 10, the servicer b is provided with many ball conveyors b1 on the surface, and the tread rubber is conveyed on the ball conveyor b1.

  After the tread rubber T conveyed as shown in FIG. 9 is released on the forming drum c, the forming drum c is rotated by rotating the forming drum c while being pressed by the pressing roller G as shown in FIG. Pasted on top.

JP-A-8-25510

  However, in the case of the above-mentioned conventional suction pad a, since the suction head part a1 is a sponge, it does not have sufficient durability and needs to be replaced in about one month. May increase.

  Further, as shown in FIG. 12, the sponge dust that has fallen from the surface of the deteriorated suction head part a1 may adhere to the suction mark J and cause appearance defects due to foreign matter contamination (FM) in the tread rubber.

  Therefore, the present invention suppresses the deterioration of the suction head portion, thereby preventing a decrease in production efficiency and an increase in equipment cost due to replacement of the suction head portion, and a suction that can prevent foreign matter from being mixed into the tread rubber. It is an object to provide a pad and a suction device.

The invention described in claim 1
An adsorption pad for adsorbing and transporting tread rubber,
A cylindrical suction head portion formed of a hard material and having an open lower end;
An adjustment plate disposed along the inner wall surface of the cylindrical suction head portion;
Elevating means for elevating the adjusting plate along the inner wall surface of the suction head portion and adjusting the length of the insertion portion inserted into the tread comb, and
The suction pad is configured to suck the tread comb by inserting the lower end of the insertion portion into the tread comb and reducing the pressure inside the suction head portion.

The invention described in claim 2
The suction pad according to claim 1, wherein the suction head portion is made of iron.

The invention according to claim 3
The suction pad according to claim 1, wherein a cross-sectional shape of the suction head portion is circular.

The invention according to claim 4
The suction pad according to claim 3, wherein an inner diameter of the suction head portion is 25 to 55 mm.

The invention described in claim 5
The suction pad according to any one of claims 1 to 4, wherein the suction head portion has a thickness of 0.1 to 1.0 mm.

The invention described in claim 6
The suction pad according to any one of claims 1 to 5,
And a vacuum unit that is connected to the suction head part and depressurizes the inside of the suction head part.

The invention described in claim 7
The suction device according to claim 6, wherein a suction pressure when the vacuum means decompresses the inside of the suction head portion is 60 to 90 kpa.

  According to the present invention, by suppressing deterioration of the suction head unit, it is possible to prevent a decrease in production efficiency and an increase in equipment cost due to replacement of the suction head unit and to prevent foreign matter from being mixed into the tread rubber. A pad and suction device can be provided.

It is a figure which shows typically the suction head part of the suction pad which concerns on one embodiment of this invention, (a) is sectional drawing, (b) is a bottom view. It is a perspective view of the suction head part of the suction pad which concerns on one embodiment of this invention. It is sectional drawing explaining adjustment of the length of the insertion part of the adsorption | suction head part of FIG. 1, Comprising: (a) is a figure which shows the case where an insertion part is shortened, (b) is the case where an insertion part is lengthened. It is. It is a perspective view of an adsorption device provided with an adsorption pad concerning one embodiment of the present invention. It is a figure which shows typically the tread rubber affixed on the forming drum with the adsorption | suction apparatus shown in FIG. It is a perspective view of the adsorption | suction apparatus provided with the adsorption pad which concerns on other embodiment of this invention. It is a figure which shows typically the suction head part of the suction pad attached to the suction apparatus of FIG. 6, (a) is sectional drawing, (b) is a bottom view. It is a figure which shows typically the suction head part of the conventional suction pad, Comprising: (a) is a front view, (b) is a bottom view. It is a figure explaining the process of sticking tread rubber to a forming drum. It is a perspective view which shows typically the suction pad and servicer in FIG. It is a perspective view of the suction device provided with the conventional suction pad. It is a figure which shows typically the tread rubber affixed on the forming drum with the adsorption | suction apparatus shown in FIG.

  Hereinafter, the present invention will be described with reference to the drawings based on embodiments.

1. Suction Device (1) Suction Pad First, a suction pad according to an embodiment of the present invention will be described. FIG. 1 is a diagram schematically showing a suction head portion of a suction pad according to the present embodiment, where (a) is a cross-sectional view and (b) is a bottom view. 2 is a perspective view of the suction head portion of the suction pad according to the present embodiment, and FIG. 3 is a cross-sectional view for explaining the adjustment of the length of the insertion portion of the suction head portion of FIG. (A) is a figure which shows the case where an insertion part is shortened, (b) is the case where an insertion part is lengthened.

  The suction pad 1 according to the present embodiment is formed of a hard material, and has a cylindrical suction head portion 2 having a lower end opened as shown in FIGS. 1 and 2, and an inner wall surface of the cylindrical suction head portion 2. And an elevating means for adjusting the length t1 of the insertion portion 6 by elevating the adjustment plate 4 along the inner wall surface of the suction head portion 2. In the present embodiment, a pair of suction pads 1 are provided as shown in FIG. Although not shown in the drawings, these suction pads 1 are arranged on both the left and right sides in the width direction of the tread rubber, and are configured so that the position where the tread rubber is sucked can be adjusted.

  In the present embodiment, an adjustment screw 7a is provided as lifting means. By loosening the adjustment screw 7a, the adjustment plate 4 can be lowered as shown in FIG. 3A to shorten the length t1 of the insertion portion 6. On the other hand, by tightening the adjustment screw 7a, the adjustment plate 4 can be raised as shown in FIG. 3B to increase the length t1 of the insertion portion 6.

  The suction pad 1 according to the present embodiment is connected to a vacuum means (not shown) of the suction device via a vacuum pipe B as shown in FIG. The insertion portion 6 is inserted into the tread rubber, and the sealed space formed by the inner wall of the suction head portion 2 and the tread rubber is decompressed by the vacuum means through the through hole 4 a provided in the center of the adjustment plate 4. Thus, the suction pad 1 is configured to suck the tread comb.

  In the present embodiment, the material of the suction head unit 2 is changed from a conventional sponge material to a hard material. By using a hard material for the suction head part 2 in this way, the suction head part 2 is prevented from prematurely deteriorating, the frequency of replacement work of the suction head part can be greatly reduced, and the deteriorated material becomes tread rubber. It does not adhere to foreign matter. The specific hard material is not particularly limited, and iron or plastic can be used, but iron is particularly preferable from the viewpoint of durability.

  Furthermore, in the present embodiment, as described above, the length t1 of the insertion portion 6 can be adjusted by moving the adjustment plate 4 in the suction head portion 2 up and down. Thereby, when the unevenness | corrugation of the surface of a tread rubber becomes large and the insertion amount to a tread rubber is insufficient, the adjustment board 4 is raised and length t1 of the insertion part 6 is lengthened, and the insertion part 6 is inserted. Can be appropriately inserted into the tread rubber and adsorbed, so that tread rubber having various surface shapes can be adsorbed.

(2) Suction Device Next, the suction device according to the present embodiment including the suction pad having the above-described configuration will be described.

  FIG. 4 is a perspective view of a suction device including the suction pad according to the present embodiment. As shown in FIG. 4, the suction device 10 includes a suction pad 1 having the above-described configuration, a lifting cylinder H that lifts and lowers the suction pad 1, an advancing / retreating mechanism E, and control means (not shown) that collectively controls them. ). In addition, G in FIG. 4 is a pressing roller.

  The advance / retreat mechanism E includes a ball screw F extending along the conveying direction of the tread rubber T, and a motor (not shown) for moving the suction pad 1 forward and backward along the ball screw F.

2. Adsorption Method Next, a tread rubber adsorption method performed using the above-described adsorption apparatus will be described with reference to FIGS. FIG. 5 is a perspective view showing a molding drum to which tread rubber is attached by the suction device shown in FIG.

(1) Adjustment of insertion part First, according to the surface shape of the tread rubber to adsorb | suck by rotating the adjustment screw 7a shown in FIG. 2 and raising / lowering the adjustment board 4 arrange | positioned in the adsorption head part 2 The length t1 (see FIG. 3) of the insertion portion 6 is adjusted to the length. Thereby, even if it is tread rubber with a large unevenness | corrugation of a surface, it can be made to adsorb | suck appropriately corresponding to the surface shape.

(2) Insertion into tread rubber Next, as shown in FIG. 4, the elevating cylinder H is extended to move the suction pad 1 downward, and the insertion portion 6 (length t1 is adjusted) ( 3) is inserted into the tread rubber T. Thereby, a sealed space is formed by the inner wall of the suction head portion 2 and the surface of the tread rubber T.

(3) Adsorption of tread rubber Next, the tread rubber T is adsorbed to the adsorbing pad 1 by depressurizing the formed sealed space through the vacuum pipe B connected to the adsorbing head portion 2.

(4) Conveyance of tread rubber Then, after the tread rubber T adsorbed by the suction pad 1 is conveyed to the forming drum, the tread rubber T is released as in the conventional case.

(5) Attaching the tread rubber After that, the tread rubber T is affixed to the molding drum by rotating the molding drum K (see FIG. 5) in a state where the tread rubber T is pressed by the pressing roller G as in the prior art. wear. FIG. 5 is a diagram schematically showing the tread rubber attached to the molding drum. When the suction device according to the present embodiment is used, the material of the suction head portion that has deteriorated in the suction mark J does not adhere as in the prior art.

  Thus, according to the present embodiment, since a hard material is used for the suction head portion, it is possible to prevent a decrease in production efficiency and an increase in equipment cost due to replacement of the suction head portion, and to mix foreign matter into the tread rubber. Can be prevented. And since it has a mechanism that can adjust the length of the insertion part, it is possible to insert the insertion part 6 of an appropriate length into the tread rubber despite using a hard material. Adsorption can be performed corresponding to a tread rubber having a different surface shape.

  In addition, it is preferable that the internal diameter d (refer FIG. 1) of the cylindrical adsorption | suction head part 2 is 25-55 mm. When the inner diameter d is smaller than 25 mm, the adsorption area becomes small and the tread rubber may not be properly adsorbed. On the other hand, if the inner diameter d exceeds 55 mm, the position adjustment range of the suction head portion is narrowed, and depending on the shape of the tread rubber, there is a possibility that it cannot be properly sucked.

  Moreover, it is preferable that thickness t2 (refer FIG. 1) of the adsorption | suction head part 2 is 0.1-1.0 mm. When the thickness t2 is smaller than 0.1 mm, the durability of the plug-in portion 6 is lowered and easily broken. On the other hand, if the thickness t2 exceeds 1.0 mm, the insertion portion 6 cannot be properly inserted into the tread rubber, and the tread rubber may not be adsorbed.

  Further, when the tread rubber is adsorbed by depressurizing the inside of the adsorption head portion, it is preferable to reduce the pressure by setting the suction pressure for sucking the inside of the adsorption head portion to 60 to 90 kPa. If the suction pressure is less than 60 kPa, the tread rubber may not be properly adsorbed. On the other hand, if the suction pressure exceeds 90 kPa, the adsorption mark J (see FIG. 5) of the tread rubber T becomes deeper and the vulcanization is continued. There is a risk of remaining as a wound.

3. Other Embodiments In the above-described embodiment, the suction head portion having a circular cross-sectional shape is used, but the shape of the suction head portion is not particularly limited. FIG. 6 is a perspective view of a suction device including a suction pad according to another embodiment, and FIG. 7 is a diagram schematically showing a suction head portion of the suction pad attached to the suction device of FIG. (A) is sectional drawing, (b) is a bottom view.

  The suction pad 1 according to the present embodiment is different from the suction pad provided with the suction head portion (see FIG. 1) having a circular cross-sectional shape as in the above-described embodiment, as shown in FIGS. 6 and 7. An elongated polygonal suction head section 2 is provided. Other configurations are the same as those in the above-described embodiment, and are denoted by the same reference numerals.

  Even in the case where the cross-sectional shape of the suction head portion 2 is an elongated polygon as in the present embodiment, basically the same effects as those in the above-described embodiment can be obtained. However, depending on the shape of the tread rubber T, it may be difficult to cope with the surface shape of the tread rubber T, and the amount of insertion may be insufficient, so that it may not be properly adsorbed. The circular suction head portion 2 is preferable.

  In addition, when using the elongate hexagonal suction head part 2 whose cross-sectional shape is shown in FIG. 7, for example, the width w1 is 13 mm, the inner dimension w2 is 48 mm, the outer dimension w3 is 50 mm, and the height w4 is 20 mm. It is preferable to set to.

  Hereinafter, the present invention will be specifically described based on examples.

1. Examples and Comparative Examples (1) Examples 1 to 8
In Examples 1 to 8, a flat tread rubber having a thickness difference of 1.5 mm or less using a suction pad having an iron cylindrical suction head portion as in the above-described embodiment. Was transferred to a forming drum, and 21,000 green tires of TOS structure pneumatic tires (size: 225 / 65R17) were formed.

  Further, in Examples 1 to 8, as shown in Table 1, the shape, size, thickness, suction pressure, and the like of the suction head portion were varied. Regarding the “dimensions of the suction head portion” in Table 1, the inner diameter d is shown in Examples 1 and 3 to 8 using the suction head portion having a circular cross-sectional shape as shown in FIG. In Example 2 using a hexagonal suction head having a narrow cross-sectional shape, the length of the inner dimension w2 is shown.

(2) Comparative Example A conventional suction pad having a suction head portion made of a sponge material was used. In addition, the tread rubber made into the object used the tread rubber same as Example 1- Example 8, and the shape of the adsorption head part, the dimension, and the suction pressure were set like Table 1. The “dimension of the suction head portion” in the comparative example indicates the inner diameter.

2. Evaluation Method (1) Evaluation of Durability The period until the suction head part needs to be replaced due to deterioration was measured to evaluate the durability of the suction head part. The results are shown in Table 1. In Table 1, “A” indicates that there is no need for replacement for one year or longer, “B” indicates that replacement is required for a period of less than one year and one month, and “C” indicates that it is less than one month. Indicates the need for replacement during the period.

(2) Evaluation of appearance defects due to foreign matter contamination After being attached to a molding drum, the suction marks formed on the tread rubber are visually observed to confirm whether or not there are appearance failures due to foreign matter contamination. The rate was calculated. The results are shown in Table 1.

(3) Evaluation of adsorption force When tread rubber is adsorbed and transported to the molding drum, it is measured when the tread rubber is not lifted due to poor adsorption or when the tread rubber falls, and the incidence of adsorption failure is calculated. did. The results are shown in Table 1.

3. Evaluation result (1) Durability of suction head part From Table 1, in Examples 1 to 8 using an iron suction head part, it was not necessary to replace the suction head part for more than one year. In the comparative example using the suction head part, it was necessary to replace the suction head part in a period of less than one month. From this, it can be seen that the replacement frequency can be reduced by using a suction pad having an iron suction head portion as in Examples 1 to 8.

(2) Contamination In the comparative example, the deteriorated sponge adhered to the tread rubber and foreign matter was sometimes mixed. In Examples 1 to 8, foreign matter was not mixed. From this, it can be seen that the use of an iron suction head portion as in Examples 1 to 8 can prevent foreign matter from being mixed.

(3) Adsorption failure Comparing the occurrence rates of adsorption failure between Example 1 and Example 2, it can be seen that Example 1 has fewer adsorption failures than Example 2. From this, it was confirmed that the shape of the suction head portion is preferably a circular shape rather than an elongated hexagonal cross-sectional shape.

  In addition, as a result of comparing Example 1 with Examples 3 to 4, it was confirmed that the occurrence rate of the suction failure was increased both when the inner diameter of the suction head portion was too small and too large. Furthermore, from the results of comparing Example 1 and Examples 5 to 8, the thickness of the suction head and the suction pressure can be similarly increased when the suction failure rate is too small or too large. It could be confirmed.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1, a Suction pad 2, a1 Suction head part 4 Adjustment board 4a Through-hole 6 Insertion part 7a Adjustment screw 10 Suction device B Vacuum piping b Servicer b1 Ball conveyor d Suction head part inner diameter E Advance / retreat mechanism F Ball screw G Holding roller H Lifting cylinder J Suction mark K, c Molding drum T Tread rubber t1 Insert length t2 Suction head thickness w1 Suction head width w2 Suction head inner dimension w3 Suction head outer dimension w4 Suction head Part height

Claims (7)

An adsorption pad for adsorbing and transporting tread rubber,
A cylindrical suction head portion formed of a hard material and having an open lower end;
An adjustment plate disposed along the inner wall surface of the cylindrical suction head portion;
Elevating means for elevating the adjusting plate along the inner wall surface of the suction head portion and adjusting the length of the insertion portion inserted into the tread comb, and
A suction pad configured to suck the tread comb by inserting a lower end of the insertion portion into the tread comb and decompressing the inside of the suction head portion.   The suction pad according to claim 1, wherein the suction head portion is made of iron.   The suction pad according to claim 1, wherein a cross-sectional shape of the suction head portion is circular.   The suction pad according to claim 3, wherein an inner diameter of the suction head portion is 25 to 55 mm.   The suction pad according to any one of claims 1 to 4, wherein a thickness of the suction head portion is 0.1 to 1.0 mm. The suction pad according to any one of claims 1 to 5,
And a vacuum unit that is connected to the suction head unit and depressurizes the inside of the suction head unit.   The suction device according to claim 6, wherein a suction pressure when the vacuum means decompresses the inside of the suction head portion is 60 to 90 kpa.

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